# US 2010/0167112 A1 · Lithium ion secondary battery

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- Number: US 2010/0167112 A1
- Document ID: US20100167112A1
- Status: Published application
- Kind: A1
- Application number: 12/600,391
- Filed: 2008-07-18
- Published: 2010-07-01
- Earliest claimed: 2007-07-19
- Assignees: Panasonic Corporation
- Inventors: Kazuyoshi Honda; Toshitada Sato; Daisuke Suetsugu; Katsumi Kashiwagi; Kunihiko Bessho
- Web page: https://patentgrep.com/patent/US20100167112A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/0421: {involving vapour deposition}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/387: {Tin or alloys based on tin}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 10/446: {Initial charging measures}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A lithium ion secondary battery including: a positive electrode current collector; a positive electrode active material layer that is provided in contact with the positive electrode current collector; a separator layer that is provided on a side of the positive electrode active material layer on which the positive electrode current collector is not provided; a negative electrode active material layer that is provided on a side of the separator layer on which the positive electrode active material layer is not provided, that primarily contains silicon or tin, and that includes a opposing portion opposing the positive electrode active material layer and a non-opposing portion not opposing the positive electrode active material layer, the opposing portion and the non-opposing portion containing lithium produced by a thin film-forming method; and a negative electrode current collector that is provided on a side of the negative electrode active material layer on which the separator layer is not provided. Thereby, deformation of the negative electrode and deterioration in cycle characteristics accompanied by such deformation can be prevented.

## Claims

### Claim 1

A lithium ion secondary battery comprising:
a positive electrode current collector;
a positive electrode active material layer that is provided in contact with said positive electrode current collector;
a separator layer that is provided on a side of said positive electrode active material layer on which said positive electrode current collector is not provided;
a negative electrode active material layer that primarily contains silicon or tin, is provided on a side of said separator layer on which said positive electrode active material layer is not provided and a portion of the negative electrode material layer facing said separator layer includes an opposing portion opposing said positive electrode active material layer and a non-opposing portion not opposing said positive electrode active material layer, said opposing portion and said non-opposing portion containing lithium; and
a negative electrode current collector that is provided on a side of said negative electrode active material layer on which said separator layer is not provided.

### Claim 2 (depends on 1)

The lithium ion secondary battery in accordance with claim 1, wherein said lithium is inserted into said opposing portion and said non-opposing portion by forming a lithium film on the surfaces of said opposing portion and said non-opposing portion by a vacuum process before said battery is assembled.

### Claim 3 (depends on 1)

The lithium ion secondary battery in accordance with claim 1, wherein said negative electrode active material layer is formed by a vacuum process.

### Claim 4 (depends on 1)

The lithium ion secondary battery in accordance with claim 1, wherein the amount of lithium contained in said non-opposing portion is larger than the amount of lithium contained in said opposing portion.

### Claim 5 (depends on 1)

The lithium ion secondary battery in accordance with claim 1, wherein the amount of lithium contained in said non-opposing portion and the amount of lithium contained in said opposing portion are the same or almost the same.

### Claim 6 (depends on 1)

The lithium ion secondary battery in accordance with claim 1, wherein said positive electrode current collector, said positive electrode active material layer, said separator layer, said negative electrode active material layer, and said negative electrode current collector are spirally wound to form a spirally wound electrode, or said positive electrode current collector, said positive electrode active material layer, said separator layer, said negative electrode active material layer, and said negative electrode current collector are laminated to form a stacked electrode.

### Claim 7 (depends on 1)

The lithium ion secondary battery in accordance with claim 1, wherein said lithium is diffused into said opposing portion and said non-opposing portion by a thin film-forming method.